Climate
Weather in United States, month by month
Best time to visit
For mild temperatures and less rain, May, June, September are usually the most comfortable months in United States (based on recent 2025 averages near Washington, D.C.).
Average weather by month
Daytime high / overnight low (Celsius and Fahrenheit), with average monthly rainfall, near Washington, D.C.. Tap a month for details.
| Jan | 6.2°C (43°F) / -1.9°C (29°F) · 84 mm |
|---|---|
| Feb | 9.3°C (49°F) / -0.1°C (32°F) · 84 mm |
| Mar | 14.9°C (59°F) / 3.7°C (39°F) · 97 mm |
| Apr | 20°C (68°F) / 8.6°C (47°F) · 97 mm |
| May | 23.7°C (75°F) / 13.1°C (56°F) · 139 mm |
| Jun | 29.4°C (85°F) / 18.3°C (65°F) · 138 mm |
| Jul | 31.5°C (89°F) / 21.5°C (71°F) · 165 mm |
| Aug | 29.5°C (85°F) / 19.9°C (68°F) · 142 mm |
| Sep | 26.1°C (79°F) / 16.8°C (62°F) · 116 mm |
| Oct | 20.4°C (69°F) / 10.7°C (51°F) · 78 mm |
| Nov | 14°C (57°F) / 4.8°C (41°F) · 64 mm |
| Dec | 9.1°C (48°F) / 0.5°C (33°F) · 96 mm |
Updated climate normals, 2025
Climate extremes in United States
| Warmest month | July · avg high 31.5°C (89°F) |
|---|---|
| Coolest month | January · avg low -1.9°C (29°F) |
| Wettest month | July · ~165 mm |
| Driest month | November · ~64 mm |
Common questions
When is the best time to visit United States?
For a balance of comfortable temperatures and lower rainfall, May, June, September tend to be the most pleasant months in United States.
What is the hottest month in United States?
July is the warmest month in United States, with average daytime highs around 31.5°C (89°F).
What is the coldest month in United States?
January is the coolest, with average overnight lows near -1.9°C (29°F).
Which month has the most rain in United States?
July is typically the wettest month (around 165 mm on average), while November is usually the driest.